Looking on the list, it is impressive to see how many young people contribute to the world. I just want to clarify, age doesn't matter, we are always be impressed with someone who achieved something big when they were young, yes, that's correct. But for me, in terms of changes which can contribute to the world development, age doesn't matter. The achievement of Colonel Sanders at old age were just as significant with the other younger achievers. The most important things is we have to push ourselves to achieve something. Not everyone can do what Mark can do, but we can always do something. It is a choice and for us to decide whether or not to proceed. Good post nevertheless. Thumbs up.